Pipette attachment.



A. E. HUTGHINSON.

PIPETTE ATTACHMENT.

APrLIoATIoN FILED JAN. 22, 1907. BENEWBD SEPT. 1e, 190s.

Patented Apr. 6, 1.909.

- /Nl/ENTOR L f zeff'jfuz/az ATTORNEYS rm: amers .versies co..wAsHmcraN, n4 c.

UNITED sTATns ATnnT orario.

ALBERT EDWARD HUTCHINSON, OF VICTOR, COLORADO.

PIPETTE ATTACHMENT.

Application filed January 22, 1907, Serial No. 353,436. RenewedSeptember 16, 1908.

Specification of Letters Patent.

Patented April 6, 1909.

Serial No. 453,344.

To all whom it may concern,.-

Be it known that I, ALBERT EDWARD HUToHINsoN, a citizen of the UnitedStates, and a resident of Victor, in the county of Teller and State ofColorado, have invented a new and Improved Pipette Attachment, of whichthe following is a full, clear, and exact description.

This invention is directed to improvements in pipette attachments,embodying a construction easily operable to draw into the pipette whenap lied thereto, any required quantity of liquid and eject the same whendesired.

The operation of the attachment is such that the admission of the liquidto the pipette can be gaged with minuteness, making the inventionparticularly desirable in cases where precision is required.

Reference is to be had to the accompanyingl drawings forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the fig- Figure l is a perspective view ofone embodiment of my invention with a pipette applied thereto; Fig. 2 isa longitudinal, central, vertical section of the attachment to the upperportion of a pipette, and Fig. 3 is a cross section on the line 3-3 ofFig. 2 showing the roller in full.

The invention comprises a trough-like body composed of a base l withflanges 2 at each side thereof, said body being preferably constructedof sheet metal as illustrated. The flanges 2 are provided with alining,longitudinal slots 3 positioned a suitable distance from the base 1 andform bearings for trunnions 4 projecting from the ends of a roller 5,said roller preferably being knurled on its circumference and of suchlength as to neatly fit between the fianges. Placed between the base 1of the trough-like body and the roller 5 is a rubber or other flexibletube 6, the lower end of which passes through a split clamp 7,preferably formed as an integral part of said body, and provided withparal el meeting portions 8 through which a thumb-nut 9, threaded intoone of them, is passed. The clamp 7, under the action of the thumb-nut9, binds the lower end of the tube about the uplper end of a pipette 1()placed therein, as 1 ustrated in Fig.

The diameter of the roller 5 is such that it will flatten the tube andpress the inner walls thereof close together on rolling over it, asshown in 3. Itis obvious from this construction. that on placing thepipette in a liquid and grasping the trough-shaped body and roller,respectively, between the thumb and fore-finger and moving the rollerupwardly, the suction caused by this action will carry the liquid withinthe pipette. As the movement of the roller may be carried on veryslowly,the quantity of liquid sucked into the pipette may be gaged withprecision. On moving the roller 5 in the reverse direction, the liquidin the pipette is ejected.

Although I have described the construction and nature of the inventionin detail, it is obvious that the same may be variously modied; and Iconsider that I am entitled to such modifications as fall within thescope of the appended claims.

Having thus described my invention I claim as new and desire to secureby Letters Patent:

1. A pipette attachment comprising a body, a fieXible tube seated onsaid body, an expansible clamp formed at one end of said body fordetachably clamping the tube to the pipette, and a device longitudinallymovable over said tube acting` to flatten it against said body, for thepurpose described.

2. A pipette attachment comprising a trough-like body composed. of abase and side flanges rigidly connected together, a fieXible tube withinsaid body, and a device longitudinally movable over said tube, in guide-Ways provided in said flanges, acting to flatten the tube against saidbase.

3. A pipette attachment comprising a trouglblike body composed of a basewith side flanges, the latter being provided with longitudinal slots, afieXible tube within said body, and a roller having trunnions projectinginto said slots movable over said tube and acting to flatten it againstsaid body.

4. A pipette attachment comprising a trough-like body made of sheetmetal and composed of a base having flanges at each side thereof, saidflanges being provided with longitudinal slots, a flexible tube arrangedadjacent to said base, and a lmurled roller having trunnions projectinginto said slots acting when movedv over said tube, to flatten it againstsaid base.

5. A pipette attachment comprising a trough-like body having a splitclamp formed as an integral part at one end thereof,

e 'flexible tube Within said body passing` through said clamp forreceiving' one end of a pipette, means for drawing the clamp together tobind the tube about the ipette,

and e device longitudinally inovab e oyen said tube acting to Hatten itagainst said body, for the purpose described.

in testimony whereof 1 have signed my I name to this specification inthe presence of l two subscribing Witnesses.

' ALBERT' EDWARD HU'ICHINSON. Witnesses:

S. A. HARKLEY, g B. F. ZIMMERMAN.

